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A quick thermal response digital acoustofluidic system for rapid on-chip PCR
Lei Huang1, Mingyong Zhou1, Rongda Kang2
1State Key Laboratory of Precision Manufacturing for Extrem Service, Central South University, Changsha, China; College of Mechanical and Electrical Engineering, Central South University, Changsha, China.
This study introduces a novel digital acoustofluidic system for rapid Polymerase Chain Reaction (PCR). The new method achieves fast thermal cycling and high amplification efficiency, enabling quicker nucleic acid testing for point-of-care applications.
Area of Science:
- Biotechnology
- Microfluidics
- Acoustics
Background:
- Polymerase Chain Reaction (PCR) is vital for gene identification and pathogen detection.
- Microfluidic chips offer advantages for PCR but face challenges in precise temperature control.
- Integrating temperature modules into microfluidic PCR devices complicates applications.
Purpose of the Study:
- To develop a rapid PCR system using digital acoustofluidics.
- To overcome temperature control challenges in microfluidic PCR.
- To enhance speed and efficiency for point-of-care nucleic acid testing.
Main Methods:
- A digital acoustofluidic system was designed, preventing droplet movement with a PDMS ring.
- Acoustic thermal and acoustic streaming effects were coupled for internal droplet heating.
- Glycerol was added to increase droplet viscosity and enhance heating rates.
- Input power adjustment was used to establish a PCR thermal cycling control scheme.
Main Results:
- The system demonstrated a low detection limit of 0.5 ng/mL.
- Achieved a rapid thermal response rate of up to 9.4 °C/s.
- Showcased higher amplification efficiency (97.23%) compared to standard PCR.
- Completed 40 PCR cycles in 57 minutes.
Conclusions:
- The digital acoustofluidic PCR system offers rapid thermal cycling and high efficiency.
- This technology has potential for point-of-care testing (POCT) and rapid nucleic acid testing.
- The method addresses temperature control limitations in microfluidic PCR devices.
